Positive disappearing knockout pin mechanism



Sept. 9, 1952 D. MANIACI l 7 POSITIVE DISAPPEARING KNOCKOUT PIN MECHANISM Filed Jan. 14, 1949 44 I16 /4"" I L/ T *9 e L i; I IH-IH "Hill.

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Patented Sept. 9, 1952 INM resume'msArrmnrneusuoonour .12.4 onetusiu to Thisinvention relates to meshines su h as punchingror storming presses d morepartiour larly, tomeans forinsurin prompthnd etlieetiwe displacement of work from thetseut of loperutioh l otter thexmaohine has completed its working- ;stroke and while it is periorming its return stroke. .Thus,lby the time themachinehasoomplated .its return stroke preparatory to performing the next working stroke. the bed or die will h ea e n cleared forreloadin wither-new work, unit and delays and difiiculties heretofore ex .perienced in such, maohines due to work. having ounoh die holder H is .reoiiir eted w qally by means not. hown hu which vet-y welltlzhownin the .er aocording to the n .1:-

titu ar-retype of press. n nn th p e ent ease e member H is orolv de iw thjel neirofdwnwerdly dependin r ds 15 extending free y through the to be ried-orotherwise loosened and removed therefromere avoided.

"Animportant object-of the invention s to core- .vide the. die shoe or worktable-oisuohza, .machiii' with a disappearin =nin reciprocal beneath the work to porateses an elector th refor, *andope e HA further object isto provide with the operating strokes of themachine.

to the aforesaid objects, or resulting 'fromj the construction 7 or operation of theoinverition as i may becarried into- .effect, willheoome apparent es the said invention is hereinafter lurther dis.- closed, I i M VIn carrying thesaidinvention into effect, I may adopt a novel construction and arrangement of perts hereinafter described, by-wayletxemple,

having reference to the aceompanyingdrawir g,

wherein: 7

Figure 1 is-za partial-elevation of the-die sh e or a forming press to which my improved Work-'- ejecting mechanism is attached, por s of the mechanism being showntiniseotionfor clarity of illustration; and i Fi ure.2 is Va similar view to .il?igure i1 ill etrhting the partsin a difierent vposition of operation,

simllartcharectersof reference indicate. similar parts in bothfigui'es .ofothedrawinet indicates the stationary die shoeor apress and II a vertioallytmoveable punch ordie holder; I2 and I3 indicatin for the sakeotlexample,

.lower and upper the elements adopted to close :the seam oiia WOIKJIIIRQH.

ating means :for said pin adapted to effect .its leiectingzmovement duringzu portion ot thetret stroke f e neuand to .be released-at s predetermined pointinsaid return stroke I wh vbyait maylberetraoted through the die ishoe' gr table of themachine under thecontrol oi ameans :provided for that purpose.

re trigger or detent mechanism of -a, unique nature adapted {to eontrol the timing of the operation of said disa pea in ej ctor pin desir d ynohronis'm V I 30 still further objectsand advantagesqsubsidlary 7 dieshoe 10 end terminatin at their lowe ends in members not gr ater diameter than the old rods l5, so that the upper ends of these members will provide i stop shoulders l6. These members 7 it will be hereinafter referredtoas stopvmhm hers, and the maybe count rsunk and threaded on the ends or the-saidrods 15 its inuioet dli dotted ines i the awings.) to permit a oertein amount .of coaxial .edl'ustment on th sa d rods hi to vary the nosi onelsetting of the stop shoulders 16' where such ediustm nt may b thought necessary or desirable.

The stripper or elector spin H. is elso shown tusbe ngfreely reci rooatl through a guide. pening-1.8 inthe at onary d e sho ill! and havin pitsflowerend restin on a lsi ker element or plat l9. w c nor lly issupportedon h ads of studs 2.0, whi h s uds pass up a d y throu h the Said k h rplat l8 and ar seemed to th und r sid r thediefshoelll. Thelkicker plate no is var-.- tieal y slideable over the studs 20 a dwoemor ssi n sprin s 21 are interp ed between he uper surface of the said kio r pla e I 91 end the under surfeoe ofthedie shoe Ill. Theheei s of the stu s 20 obviouslylimit downwardmovemen o'f-the'kioker pletele.

Secured to he-un er s de of t kicker P ate 19. (ar blocks 22 verti ally b red ,et 23 to slide stably aoooiuodete the st p. members It, the h the plate beingsimilarly bored at 24. Each Ibloclc 1 12-extehds1e erhl1y 0f therod tim d 1831 5037815..-

ti ally bored et 4' to r o ve z n nl rlge stop member .15 of e detentgstud 26 which stud is biased upwardly of the table l9 by a spring 2]. I

Each solid 26 passes ir'eely throughthe kicker p ate 19 endthe upper shoulder ,25' of i p member .25 and form th s op proper. The up- ;per endof the said stud-2611s normally spaced ir m-theunderside of the die sh e. 10 a cle r y illustrated in Figure 1. l l

Each of the locks 22 is pr videdw th ross oessagewzobetween the two b res-23 a R e -ae omodat ermovabl latch in the fo m of a ball 29 which-a cordin to'th zp i on i h ports; impinges either the shoulder IQ of the 51601111 1 11.-

her L516! the shoulder 215' of the iStOpm'embe-r 25, 848717118 (ruse-may be.

Thesstopmember may be adjustable pnits -stud iii :in the same manner as s'described with springs 2| as described.

pingement with the said shoulders l6 as result of the springs 21 being freeto raise the stop members 25, as clearly shown in the said Figure 1. In this position of the parts, both the s'pr ings' 2i and the springs 2! are fully extended, and the 4 nature. Furthermore, while the two stop assemblies are illustrated as providing a desirable balancing of forces about the working center of the press, one or any desired number on such assemblies may be utilized, according to the size and type of press and the position of the dies thereof. The disappearing ejector pin may serve to completely eject work from the machineor to merely loosen'jor displace it tolanextentfwhereby it is 10 ily interfering with the continuous operation of readily removedfrom the dies without necessarthe machine.

E -'Ihis'.ir'1ventionmay be developed within the "scopeof the following claims without departing upper ends of the studs 26 are spaced from the underside of the die shoe Hi, the ejector pin-l1 being in a retracted position wherein its upper,

end is materially below the work I4.

As a result of this locking of the balls 29 in this impinging position, subsequent vertical movement of the' rods [5 (upon the upward movement of the: die holder H as indicated by the arrows in Figure 2), causes the said stop members l6, through'the impinging latch balls .29, to raise the kicker plate [9 and compress, first, the springs 2 l and subsequently the springs 21, as the studs 26 contact the underside of the dieshoelfl. i J Thus; continued upward movement of the die jh'older |l will'result in the stop members 25 of the detent studs zfijpassing downwardly through the bores 24 of the blocks 22 as the said springs 2'! are further compressed. This relative movement of the stop members 25 downwardly jthrough the said bores 24} eventually permits the latch'balls 29 to move inwardly of the bore 24 and along the cross passage 28 out of the path of the shoulder l6 of the stop member [6, which "thus permits the springs 2| to urge the kicker plate [9 downwardly over the said stop members 16 untilfthe said plate I9 again comes to rest against the heads of the studs 20. v

The balls 29 are now held in impingement with the shoulders 25" ofthe stop members 25 by the stop members I6, maintaining the, springs of the detent studs 26 in a partially compressed condition even though the upper ends of these studs are still in spaced relation to the under side of the die shoe l; but, as the upper die holder ll again descends for its next forming operation, the downward, movement of the stop members IE or the rods I will cause their shoulders IE to again pass the ba1ls 29, whereupon the action of the springs 21 will raise the stop members 25 in their bores 24 and so permit these stop members '25 to move and lock the balls 29 in impingement with the'shoulders it of the stop members Hi, the cycle of operations being repeated as thepress operation is continued. i Y I Obviously the described motion of the kicker plate [9 is transmitted to the ejector pm I! so that the upper end of this pin willdislodge or eject the work [4 from the lower die member l2 as the return movement of the die member ll opens the dies and raises the kicker plate lain the manner described, the said ejector pin ll simply descending (as by gravity in the illustrated example) with the said kicker plate whenever it is moved downwardly by the action of the It will be understood that while the press enibodying the invention has been described as vertical, the-arrangement is 'quite"adaptable' to :press'esorimachineskofan inclined or horizontal from the essential features of the said invention and it is desired that the specification and draw- I ingloeread as being merely illustrative of a praca work-dislod'ging element perpendicularly guided in said shoe and carried by said plate, m'eansbiasing said plate away from'said die shoe, a housing carried by said plate, a reciprocal rod extending perpendicularlythrough said housing, a'reciprocal stud in parallel spaced relation to said rod also extending through said housing with its upper end normally spaced relative to the under side of said die shoe, said stud being biased in the direction of said-shoe, a detent guided laterally in said housing, and bevelled stop members on said rod and on said stud for alternately engaging said detent as said stud is moved against its bias by contact with said shoe' or is in its normal position'free of'said shoe, whereby saiddetent is normally held in impingement withthe shoulder of the'stop member of said rod until released by said movement of said stud.

2. In combination'withthe upper die holder and lower die shoe or a press, a kicker plate mounted in's'pace'd relation beneath saiddie shoe, a work-dislodging element perpendicularly guided in said shoe and carried by said plate, means biasing said-plate away from said die'shoe, a

housing, and bevelled stop members on said rod and on said stud'for alternately engaging said detent as said stud is moved against its bias by contact with said shoe or is in its normal position free of said shoe, at least one of said stop members being mounted for adjustment in the direction of the press motion, wherebysaid detent is normally held in impingement with the shoulder of the stop member or said rod until released by saidmovement of said'stud. p

3. In combination with the upper die holder and'lower die shoe of apress, akicker plate mounted in'spaced relation beneath said die shoe, a workdislodging element prpendicularlyguided in said shoe and carried by said plate, means biasing saidplateaway from said'dieshoe, a reciprocal housing carried bysaid plate, a rod extendrelation to said rod a1so"extendi'ng through said housing with its upper end normally spaced relative to the under side of said die shoe, said stud being biased in the direction of said shoe, a detent guided laterally in said housing, and bevelled stop members on said rod and on said stud for alternately engaging said detent as said stud is moved against its bias by contact with said shoe or is in its normal position free of said shoe, whereby said detent is normally held in impingement with the shoulder of the stop member of said rod until released by said movement of said stud, said stop members being mounted for adjustment in the direction of the press motion.

DOMINIC MANIACI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 748,612 Johnston Jan. 5, 1904 819,639 Eustice May 1, 1906 929,594 Hunter July 27, 1909 2,229,393 Steffen Jan. 21, 1941 

